Trains West Coast could now purchase the tickets until minutes before departure.

They are joined by those using the Caledonian Sleeper from London to Scotland.

The increased flexibility is the latest action to emerge following the fares and ticketing action plan set up last year by government.

“Not everyone can plan journeys in advance and now more people can buy cheaper tickets on the day, even on their way to the station,” said Jacqueline Starr, managing director of customer experience at the RDG.

“We want customers to get the best possible deal whenever they travel.”